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Improved measurement of the shape of the electron

Author

Listed:
  • J. J. Hudson

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

  • D. M. Kara

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

  • I. J. Smallman

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

  • B. E. Sauer

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

  • M. R. Tarbutt

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

  • E. A. Hinds

    (Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK)

Abstract

How round is the electron? The electron is spherical — well, nearly. The standard model of particle physics predicts a slightly aspheric electron, with a distortion characterized by the electric dipole moment (EDM) that is far too small to be detected at current experimental sensitivities. However, some extensions to the standard model predict much larger EDM values that should be detectable. New experiments, using the dipolar ytterbium fluoride rather than spherical thallium, achieve the highest precision measurement of the EDM to date. At this new level of precision the EDM is consistent with zero, and the electron is indeed a sphere. This finding should help to constrain theories of particle physics and cosmology beyond the standard model.

Suggested Citation

  • J. J. Hudson & D. M. Kara & I. J. Smallman & B. E. Sauer & M. R. Tarbutt & E. A. Hinds, 2011. "Improved measurement of the shape of the electron," Nature, Nature, vol. 473(7348), pages 493-496, May.
    • Handle: RePEc:nat:nature:v:473:y:2011:i:7348:d:10.1038_nature10104
    DOI: 10.1038/nature10104
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    Cited by:

    1. Paweł Moskal & Eryk Czerwiński & Juhi Raj & Steven D. Bass & Ermias Y. Beyene & Neha Chug & Aurélien Coussat & Catalina Curceanu & Meysam Dadgar & Manish Das & Kamil Dulski & Aleksander Gajos & Marek , 2024. "Discrete symmetries tested at 10−4 precision using linear polarization of photons from positronium annihilations," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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